I think Network Engineering work here at the moment needs other skills other than cisco. You might want to take other technologies like juniper, checkpoint, f5, vmware to become more marketable. Otherwise, you will find it hard to get a job. One more thing, more and more IT jobs becomes contractual here. It may not be safe for others to come this time specially if you are giving up your career and have a big family unless you have enough fund and relatives to stay while looking for work. Hope this could give you some insight of what you will get into when you are here in Australia (Sydney).